Geometric Inequalities
By O. Bottema, R. Ž. Djordjević, R. R. Janić, D. S. Mitrinović and P. M. Vasić. Pp. 151. (Wolters–Noordhoff: Groningen, 1969.) $4.90.
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HIRSCHFELD, J. Triangular Puzzles. Nature 225, 1268 (1970). https://doi.org/10.1038/2251268b0
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DOI: https://doi.org/10.1038/2251268b0